public ShiftDown() {
   shiftSub = Shifters.getInstance();
   requires(shiftSub);
   // Makes this command interrupt another
   // command using the same subsystem
   setTimeout(0.1); // Set the time the piston should fire
 }
 protected void end() {
   shiftSub.shiftOff();
   // Shut off solenoid
 }
 protected void execute() {
   shiftSub.shiftDown(); // Shift down
 }